Guys, Do you think this means he still likes me or was he just being friendly?

Ok, so me and my ex have 'dated' twice. The first time 3 days, 2nd time 1 week...😐 and he normally always talked to me and sat by me at school last year, and well today was my first day back and he actually pinched my waist and said 'bulge!' And he also waved at me 3 times today and he's been staring at me... I was just wondering if these are signs he still might like me or was he just being friendly? Any advice would be HIGHLY appreciated! I'm just so confused right now... Because i still like him...